It is wiser to have your GC holder spouse to file petition for you and wait for your GC for the next 4 yrs or more.  Please do not wait until your wife becomes citizen for her to file petition on your behalf.  When your wife becomes citizen, which she has to wait for 3 years just to apply and another 6 months or so to get the citizenship (total 3.5 yrs to become citizen), she can file petition again as a US citizen on your behalf.  This will take another 6 months for you to get he GC as a wife of a citizen.  So total wait time for you is still 4 years, even as a spouse of a citizen.  You can go both ways and see which one is faster.